Island



(Nb Model.)

P.- I. DANA.

EXPANSIBLE PULLE'Y.

Patented Aug. 24,1897.

77 7;??? wu'aot UNIT D STATES'EPATENT Quince,

FREDERICK I. DANA, OF PROVIDENCE, RHODE ISLAND, ASSIGNOR TO THE THOMASPHILLIPSCOMPAN-Y, OF SAME PLACE.

EXPANSIBLE PU LLEY.

SPECIFICATION forming part Of Letters Patent No. 588,898, dated August24:, 1897.

' Application filed August 27, 1896. $e1'ial No. 604,105. (No model.)

To all whom it may concern: the product of the machine correspondinglyBe it known that I, FREDERICK I. DANA, of increased.

Providence, county of Providence, State of The invention consists in thefeatures Rhode Island, have invented certain new and and combinationshereinafter described and 5 useful Improvements in Expansible Pulleys;claimed.

and I do hereby declare-the following speci- The accompanying drawingshows a longification, taken in'connection with the accointudinalsection of a pulley and its operating panying drawing, formingpart ofthe same, to means embodying the present improvements be a full, clear,and exact description thereof. in their preferred form. to The presentinvention relates to that class As shown in the drawing, the pulley Acon1- of pulleys which are so constructed that their prises any desirednumber of sections 1, (two diameter may be increasedor diminished atonly of which are shown,) provided with pro- Will and to the means forvarying the diamejecting bars or arms '2, which are adapted to ters ofsuch pulleys, and has forits object the slide radially in guides 3,formed on the hub 15 construction of a pulley of the above class 4:. Thesections 1 maybe moved radially by which may be readily applied in thoserelaany suitable means which is so constructed tions in which expansiblepulleys are emthat it maybe operated while the pulley is in ployed andwhich may be quickly and accumotion and, as shown, is so moved by meansrately adjusted to the desired diameter withof a slide 5, acting througharms 6 and toggles 7o 20 out stopping the rotation of the pulley. 7. Thetoggles Tare formed by the arms 8 Expansible pulleys are frequently usedas and 9, pivoted together at 10, the arms 8 bedriving-pulleys formachines, the speed of ing pivoted at the opposite ends to the hub 4which must be frequently varied to suit the at 11 and the arms 9 beingpivoted at their varying conditions of the material passing oppositeends to projections 12, formed on 2 5 through the machine, and when suchpulleys the bars 2. The arms 6 are pivoted to the have been used theyhave commonly been of toggles '7 at 10 and to the slide 5 at 13. such acharacter and the means for varying The slide 5 may be operated byanysuitable their diameter has been so constructed that means under thecontrol of the operator, it has been necessary to stop the rotation ofwhich is so constructed and connected with o the pulley, and thus theoperation of the masaid slide that said slide may be operated chine,when the diameter of the pulley was to while it and the pulleys are inmotion, and be varied to vary the speed of the machine, in the drawingis shown one form of such opand the production of the machine thusreerating means, which is as follows: duced proportionally. Moreover, insuch Surrounding the shaft 14, to which the 3 5 cases the variation ofthe diameter of the pulley is secured, is a non-rotatable screwpulley toproduce the necessary variation in threaded member in the form of asleeve 15, speed was necessarily a matter of guesswork provided with aflange 16, which fits Within and several stoppings and adjustments werea recess formed in the slide 5, being held frequently necessary beforethe exact variatherein by a collar 17, secured in the end of 40 tion inthe speed required for the proper opsaid recess by the screws 18. Anantifriceration of the machine was attained' WVith tion-washer 19 isinterposed between the end the present improvements, however, the diofthe sleeve 15 and the end of the recess. ameter of the pulley may bequickly and ac- The sleeve 15 fits and slides within a stacuratelyvaried without interfering in any tionary bracket or support 20 and isheld 5 4 5 way with the running of the machine to which from rotation bya screw 2] the end of which the pulley is applied, and the means forvaprojects into a slot formed in said sleeve,- rying the diameter of thepulley is always The end of the bracket 20 is oounterbored to under thedirect control of the operator, and form a bearing for ascrew-threadedmember thus the speed of the machine may be graduin theform of a nut 22, which does not rotate mo 56 ally and quickly changedto produce the best with the pulley, but is normally stationary resultswithout stopping the. machine and relative thereto. The nut 22 engagesthe threads of the sleeve and is held from longitudinal movement by thescrews 23, which enter a groove formed in said nut. Ahandwheel A issecured to the nut preferably by being formed integrally therewith.

The operation is as follows: When the pulley A is in motion, the slide 5rotates therewith While the sleeve 15 and the nut 22 remain stationaryand through the connections described maintain said pulley at a constantdiameter. If it is desired to vary the diameter of the pulley, it may bequickly and accurately done without stopping the pulley by moving thehand-wheel El, thus causing the nut 22 to move the sleeve 15 and throughit the slide 5 in either direction. The movement of the slide actsthrough the arms 6 and toggles 7 to move the sections 1 either toward oraway from the hub of said pulley, thus contracting or expanding saidpulley.

\Vhat I claim as my invent ion, and desire to secure by Letters Patent,is-

1. The combination, with an expansible pulley, of means for varying thediameter of said pulley comprising a screw-threaded member normallystationary relative to said pulley, and a non-rotatable screw-threadedmember operated by said former member, substantially as described.

2. The combination, with an expansible pulley, of means for varying thediameter of said pulley comprising a slide, a non-rotatablescrew-threaded member for operating said slide, and a rotatable nutnormally stationary relative to said pulley for operating saidscrew-threaded member, substantially as described.

3. The combination, with an expansiblc pulley, of means for varying thediameter of said pulley comprising a slide, a non-rotatablescrew-threaded sleeve for operating said slide, and a rotatable nutnormally stationary relative to said pulley for operating said slide,substantially as described.

4. The combination, with an expansible pulley comprisingradially-movable sections, of toggles connected to said sections, aslide for operating said toggles, a non-rotatable screw-threaded sleeveconnected with said slide, and a rotatable nut normally stationaryrelative to said pulley engaging said sleeve, substantially asdescribed.

5. The combination, with a pulley provided with radiallymovablesections, of toggles connected with said sections and said pulley, aslide, links connected with said slide and said toggles, a non-rotatablescrew-threaded member for operating said slide, and a rotatable nutnormally stationary relative to said pulley for operating saidscrew-threaded member, substantially as described.

FREDERICK I. DANA.

\Vitnesses:

W. H. THURSTON, IRA L. FISH.

